Stopping and starting mechanism



A. R. SCHOENKY.

STOPPING AND STARTING MECHANISM.

APPLICATION FILED MMLZZ, 1919.

Patented Sept. 7 1920.

A TTOR/VEVS the following is AUGUST R. SCHOENKY, OF SOMERVILLE, MASSACHUSETTS, MACHINERY COMPANY, 013 BOSTON, MASSACHUSETTS, A

CORPORATION OF MAINE.

STOPPING STARTING MECHANISM.

To all whom it may concern:

Be it known that I, AUGUST R. SOHOENKY, a citizen of the United States, residing at Somerville, in the county of Middlesex and State of Massachusetts, have invented oer tain new and useful Improvements in Stopping and vStarting Mechanism, of which a specification, reference being had therein to the accompanying drawing. j

This invention is a novel stopping and starting mechanism, for example, for power driven sewing machines, and more particularly the invention is a combination of such a machine having certain characteristics, with a stop motion having certain cooperating characteristics. i

As a suitable example I may refer to machines for stitching-shoe uppers to sole lips,

this well known class of machines operating usually to produce a chain stitch, and em bodying a hooked, curved needle and co: operating stitching instruments driven from the main or operating shaft. Moreover, the particular design or embodiment of the present invention which will be herein described is best adapted for use on such a machine not having excessive momentum, but on the contrary relatively light running and easily brought from full operating speed to a stop. I may recite as a typical instance of such a machine for stitchin shoe uppers to sole lips the prior patent of zaleski and Schoenky No. 1,288,366, patented December-17, 1918, the smooth and light running qualities of which are secured by cranks, links and leversby which the rotation of the operating shaft is communicated to the several stitching instruments; and the present invention is shown as applied to a crank, link and lever driven machine for stitching shoe uppers to sole lips constructed substantially on the principles of said patent. The main object, therefore, of thepresent invention is to provide a practical, convenient and efiicient sto motion adapted to the purposes recited. 1E peculiarity of machines for stitching shoe uppers to sole lips employing a curved, hooked needle is that in the ordinary cycle of actions in producing each stitch the needle stands substantially within and projecting through the work for one stitch at the point of time in which the preceding stitch is completely formed and taken up, so that, if the machine be stopped Specification of Letters Patent.

Application filed March 22,

at this drawn the employment of Patented, Sept. 7, 1920. 1919. Serial No. 284,451."

point of the cycle, the work is held by the needle and incapabl moval from the machine; whereas if the ASSIGNOR 'ro manor: SHOE e of easy remachine be stopped at a later point in the cycle, namely, after the. needle has withfrom engagement with the work, the thread continues to remain engaged with the needle, and again stands in the way of easy removal of the shoe from the machine. Various schemes have been suggested for automatic prevention of either of the described objectionable conditions upon the stoppage of the machine, but to the present day the plan most commonly practised in the art is thestoppage of the machine without stop motion namely, by placing the hand on the.hand wheel of the operating shaft until the forward rotation ceases, but continuing the rotation by arrives at the position wherein the stitch cycle will be completed, with the needle engaged in the work, followed by a sufficient reversal by hand, judged by the experience and observation of the operator, to. cause the retraction of the needle and the freeing of the work for its removal. This mode of stoppage possessed various disadvantages, of which the most pertinent are the necessity of the operator taking his concentratedattention from the stitching in order to give it to the stopping and reversing actions described, and further the necessity of his removing one hand from the work, which theretofore he has effectively guided by the use of both hands.

A particular object of this invention, therefore, is to afford a stop motion whichwill overcome the recited objections and permit the" operator to" concentrate his attention on the manipulation ofthe shoe and the formation of the stitches until the machine hand until the shaft 3 is stopped, and will automatically bring about the stoppage of the forward rotation of the shaft at the proper point at the end of the stitch cycle, with the needle engaged. in the work, yet will permit subsequently and facilitate the necessary further motion or reversal of the shaft to retract the needle and free the work for its removal.

' A further object is to afford a stop motion which will accomplish the purposes just mentioned, and additionally will afford a machine soequipped that it may be stopped more than once or repeatedly, and restarted again during the stitching of a single shoe,

part hereof, Figure 1 isa front elevation consists in the novel machine,

and without incurring the reversing action mentioned until time for the desired retraction of the work upon the completion of the same.

description of one form of design orembodiment of the invention, as will be apparent to those skilled in the art.

To the-attainment of the objects and advantages referred to, the present invention mechanisms, combinations, arrangements, .devices and other features herein described or illustrated. I a;

In the accompanying drawings forming a of a stitching machine of the class mentioned, including the stopping and starting mechanism at the left end of the operating shaft.

Fig. 2 is a right elevation, partly in section, of the Fig. 3 is av guard disk 38 shown in Fig. 1. right elevation, partly in section, of the non-rotating clutch member 26 shown in Fig. 1. 7

Fig. 4 is a partial left elevation of the stitching mechanism with the frame broken away, the parts omitted.

The main or operating shaft '53 of the I machine is shown as extending from the stitching driving connections and starting and stopping mechanism at the left to the stitching mechanism at the right, the shaft being broken awayto indicate the omission ofnumerous parts not essential to the explanation of the present improvement. One of the bearings for the shaft 53 is the standard 54, and

made to the before mentioned Patent,

1,288,366, or-to copending application Serial No. 255,536, filed September 24, 1918, by the cut. I have, however, shown: certain of'the mechanism which I will now refer to. The shoe S is shown in the position in which it is held by the operator during the progress of the stitching. The shoe'i's held against a support or guide is fed toward the left in Fig. 1 by suitable feeding means not shown,-while the needle and coiiperating. stitching instruments perform thestitching. The main shaft 53 and all the other parts in all'the figures are shown in the position which they occupy 'atthe end of astitch cycle, and the needle C, as before explained,

Otherand more particular objects andthe main shaft in section and many ofother than the needle connections i shaft, and the lever 73 extends from this at the extreme left the shaft carries a wheel 55, which serves as a hand of said pat-'- the needle may be as, follows. The main shaft 53 is shown as provided with a crank- 57, which is illustrated inits lowest position. Extending forwardly and downwardly from the crank 57 is a short pitman orlink 62. The free end of the pitman 62 may be guided as follows. Pivoted on a longitudinal axle f forward and I slightly higher than "the oscillating- In its advancing main shaft is an arm 69, which extendsdownwardly and rearwardly, and is pivoted ,to the free end of pitman 62, thus controlling its movement during the rotation of the crank. From the stud connecting the pitman and the arm extends downwardly and rearwardly a short link 70, which serves as a connection to a long oscillating lever 73. The lever 73 has its hub '72 mounted on an axle considerably to the rear of the main own pivotjstud 0, and the link 80 extends diagonally therefrom downwardly and rearwardly to the free end of the aforesaid long lever 73. i

By theseconnections the curved hooked needle, which is attached to the needle block in a position concentric, with the center of oscillation, operates to advance in an arc and penetrate the work, as before described, and before retracting, to receive a loop of the thread, then drawing the thread-through the work, and on the succeeding forward stroke occupying such loop and penetrating the work at a new point. en any stitch has been completed, and the needle stands forwardly in the position shown in Fig. 1, it will have been engaged by a new thread loop. If now the forward rotation continues, the thread will be drawn through the work to form, or as if to form, By the present invention the. machine will be stopped with the parts in the position shown, and the stopping connections will "be anew stitch.

v able time,

stitch is completed and the needle stands in v the work.

7 referably frictional stoppage is'employed which may give a sufficiently accurate .final stoppage point, in view of frictional stoppage member 22. This has at its the light running qualities and low momentum of the machine, but preferably also the is supplemented by an impact means toinsure the proper final position of the shaft.

One characteristic, therefore, of the pres ent-stop motion is that it brings the shaft to' rest in a position with the needle engaged in the work, this being the endof the stitch cycle, and as will be more'fully explained. -Another characteristic of the stop motion is its construction to readily permit the operator through the hand wheel 55 or otherwise to reverse the shaft, ,thereby disengaging the needle both from the thread and from the work, and attaining one of the objects originally recited. A is that, when the stop motion has brought the shaft to rest with the needle in the work,

as described the operator at his election may either reverse the shaft forthe removal of the work, or restart the-shaft for the continuance of stitching. Thi latter characteristic is of substantial value in such a machine, because permitting the operator to stitch around the sharp toes or other difficult parts of shoe by short stretches of stitches, so that he may properly guide, turn and inspect the work between stitches during this delicate operation.

' In none of the prior attempts to afford automatic stoppage to a machine of the kind described, of which I am aware; has it been possible to exercise any choice or control such as described, or to bring about a restartingand continued stitching after let-up of the needle and stoppage.

Coming to the details of structure and design of the illustrative embodiment of the invention, the shaft 53 is shown as extended considerably to the left beyond the standard or bearing 54, and with the. hand wheel 55 at the leftextremity. As a source of power I show a belt 19 running on a pulley 20, the pulley being mounted loosely on the 1 shaft 53, and provided with a conical clutch recess 21 at its right face. Keyed upon the shaft 53 to the right of the belt or power pulley is a double acting shifting clutch left end a cone 23, adapted to engage in the recess 21 of the power pulley. By this engagement the 'is suitably ard 54, that is, to the left to enable further characteristic When the 26 until a stitching machine can be clutched to the power pulley and driven.

The clutch member 22 at itsright hand end has a second friction cone 24. This is in the nature of a braking or retarding member, and engages in a conical recess 25 in a non-rotating clutch or brake member 26, which surrounds the main shaft 53 and connected to the bearing standor enlarged head 01' end 54 thereof.

The clutch member 22 requires to be,

shifted to left or right for driving or stopping the machine, and for this purpose is. provided with a peripheral groove 27, engaged by the opposite pins 28 of a forked clutch member 29, connected by a pivot 30 to a fixed bracket 31. The shift lever 2.9 has an upward extension 32, which is pulled rightward by a spring 33, so as tov cause the clutch member 22 to normally engage with the non-rotating complementary clutch or brake member 26,'thus bringing and holding the main shaft at rest. The pull of the spring 33 determines the braking force, and this to be adjusted there is shown a screw thread adjusting device 33, by which the spring is connected to a fixed part orbracket extending from the bearing standard 54.

For shifting the clutch to cause the starting of the shaft into rotation the lever 29 is provided with a rightward extension 34, and this is connected by a link 35 with a reversing lever 36, centrally pivoted and having a pedal rod 37 extending downwardly to a pedal 37. When the operative depresses the pedal 37, the clutch lever 29 and member 22 are thrown leftward, causing the cone 23 to engage the recess 21 of the power pulley 20, thus bringing about full speed drive. pedal is released, the spring 33 comes into action to force the clutch member 22 to the right, causing it to engage the friction brake member 26, which quickly brings the shaft to rest. Owing to the slight 110 tion as described might cause the shaft to stop at any indefinite point, whereas itis desired to stop the parts at the end of a stitch cycle, means are provided to prevent the application of the friction, that is, the engagement of the co-acting members 24 and predetermined extent, for example, a' quarter rotation, rior to the desired final stopping point. suitable means for this purpose'consists of a guard ondisk 38,- pinned to theshaft 53, so asto rotate face,

son'to be explained, the righthand end of the guard pin is also capable of swinging up and down, and the standard is recessed as shown, to admit this motion, while a spring 40 is provided tending to, thrust theguard pin to its upper or normal position, which is shown in dotted lines in Fig. 1.

The guard pin 40 effects control over the clutch, and to bring, this about is shown as connected by a link 41 with the clutch lever 29. The right extremity of the" guard pinis normally to the left of the guard disk 38,

- the latter preventing it from moving rightward to the position shown in full lines. By

this construction the clutch lever 29 cannot move toward the right to throw in the friction-brake members untilthe guard disk 38 permits the pin 40 to move'rightward to the position shown. The operation of these parts is that about a quarter rotation before the final stoppingpoint, the pin 40, which 1s caused to tend toward the right by the spring 33, when the pedal 37 has been let up, is enabledto drop into the groove 39 v of the guard disk. For this purpose the lution in extent, and it is preferably slightly eccentric, so that the pin 40 can only drop into the initial or first end 39 of the groove. At this stage the disk and groove will be in the position shown in dotted lines in Fig; 2,'

while 'the pin will be at its elevated posi-' tion slightly hi her than the full line position shown in ig. 2. As soon'as the pin drops into the groove, the clutch shiftsand thefriction takes effect fora quarter rotation up to the point of final sto' page, which is that shown in full lines in A slight variation would be o no consequence. While friction is never entirely accurate or constant in its operation, it may in this case be so adjusted as to preclude the possibility of premature stoppage, and the described mechanism may by providin a slight enlargement at the terminal en of .the groove 39,.and placing therein a suitable spring bufit'er device 42, to take up the final impact. The rebound. would be'neg'ligible, and would be instantly taken, up, because the stopping frictionremains in effect.

The mechanism thus far described serves practically to bring the machine to a stop at the end of a stitch cycle and with the needle engaged in the work. The illustrated stop motion isso'constructed asto now permit and facilitate the ready backing up offtheshaft to .the proper extent, namely, about a quarter revolution, forthe purposeof retractin the needle to disengage. it from the work, t us freeing-the work for ready the extent 0 roove 39 is shown as about a quarter revoi s. 1 and '2.

be supplemented up to the sired to attained in the illustrated machine by constructing and combining the non-rotating clutch or friction member 26, so that it may receive a slight reverse rotation, that is to say, about a uarter rotation, depending on reverse needed to bring the empty needle back out of the work.

To'this end the friction'brake member 26 ,is shown as loosely surrounding the shaft 53,'but limited in its movement by means-of a fixed pin 43, secured in the bearing standard 54, and projecting leftward into a quadrantal groove or recess 44 in themember 26,- as more fully shown in the righthand view, Fig.13. A helical spring 45 is inserted within the friction member 26, and surrounding the shaft 53, and so arranged as to tend to rotate the member 26 forwardly, that is, in the direction of the long arrow, Figs. 1 and 3,v so as to hold it normally in the position shown in Fig. 3 against the stop pin 43. The spring 45 has one end 46 projecting into the bearing standard extension 54*, and its other end 47 into the brake member 26. l

By this arrangement the friction member 46 serves effectively as a brake to effect the stoppage of the forward rotation of the aftersuch stoppage at the end of a stitch cycle to be reversely' rotated, that is, in the Y direction of the short arrows, and to the extent of the length of the groove 44, that is, about a quadrant in this case, despite the frictional grip of the member 26 on the clutch member and shaft. The spring 45, while effective for normally maintaining the member 26in its proper position, offers but negligible resistance to the described reverse rotatlon. The enga ement of the guard pin- 40 with disk 38 is o no hindrance to the reverse rotation, because-the quadrantal slot 39 freely permits the parts to be shifted back from the full line to the dotted line position shown in Fig. 2. I

Another concrete advantage in the described; structure is that, owing to the groove 44 having a predetermined length,

depending on the extent of reverse rotation required to withdraw the needle effectively from the. work, this gives" the operator a proper indicationas tohow'far he has to reverse the shaft, thus taking his-attention into the groove 39 of the guard disk, the

friction takes effect and the shaft comes to rest in the position shown. The operator keeps both hands-"on the shoe, guiding it, last moment.

If it is now' de and .observation entirely away from this part of the operation. When the end of a 120 extract the shoe from the machine,

groove 39. At the needle is retracted The spring 45 cause the forward rotation of the shaft, and therefore stitching'of the toes stitching.

combination of such member 26 forwardly when the shaft has been reversed, as described, the friction will hold it in that position, and the operator is not compelled to maintain his hand onthe reversed wheel 55 during or after the extraction of the shoe.

After the machine has been so stopped and reversed and the work extracted, the process of resuming stitching on another shoe is simply to insert the shoe in place and press the pedal 37. This simultaneously throws the clutch member 22 across to the power pulley, and withdraws the guardpin 40 from the guard disk. The spring 45 automatically and at once rotates the friction a quarter turn to its normal position shown.

When the shaft has been stopped, but before the reversal and extraction of the work, the operator may restart the stitching on the same shoe, which affords an advantage in certain classes of wor of pointed shoes, in desirable toproceed or more stitches at which it is sometimes by making one or two a time, followed by stoppage and resumption, enabling the operator to more deliberately swing the shoe around to accord with the progress of the stitching. This function may be attained by merely depressing and immediately releasing the pedal, which will start up the machine and-cause its prompt stoppage after only a single stitch,'if desired. Such stoppage is always at a point with .the needle in the work, so that the needle forms a pivot about which the work may be swung in turning it for further The stoppage of the forward rotation is automatic, but the described reversing action, being non-automatic, may be completion of the stitch' g of the shoe, at which time, by reversin the hand Wheel as described, the

completed shoe may a new one inserted.

It will thus be seen that I have thus described a stopping and starting mechanism embodying the principles and attaining the objects and advantages recited, and also a mechanism with a stitching machine of the particular'class referred to, wherein each stitch cycle is completed at a time when the curved hooked be readily removed and needle is engaged within the work. Sincev many matters of design, arrangement, form,

and other features may be variously modified without departing combination, details or by the engagefor example, in the from the principles involved, no limitation to such features is intended except in so far as referred to in the appendedclaims.

What is claimed is: g I

1'. In a machine for stitching shoe uppers to sole lips, chain stitching mechanism comprising a curved hooked needle operating so that the needle stands in the-work at the completion of each stitch, a frictional stopping means controlled to cause stoppage with the needle in the work, and a slip connection associated with said stopping means such as to permit reversal suflicient to extract the needle.

2. In a machine for stitching shoe uppers to sole lips, chain stitching mechanism comprising a curved hooked needle operating so that the needle stands in the work at the completion of each stitch, an operating shaft actuating said stitching mechanism, drive means for rotating said shaft, a control lever or pedal, connections controlled by said lever for applying forceto stop the shaft, means associated with said stopping connections to insure the shaft stopping at the completion of a stitch with the needle engaged in the work, and a slotted or recessed part associated with said stopping connections to permit reversal of the stopped shaft to an extent to extract the needle; whereby when the machine isstopped the operator at will may restartit' or reverse the shaft to extract the needle and release the work.

3. In a stitching machine an operating shaft, stitching mechanism actuated thereby, drive means therefor, and a stoppin mechanism comprising opposed cooperatlng friction members, one turning with the shaft, the other non-rotatable but fitted to turn reversely for a fraction of a rotation, whereby on stoppage the shaft may be manually reversed for such fraction of a rotation.

4. A ower driven shoe sewing'machine of the class known as welt-and-turn stitching machine, adaptedf0 stitching the shoe' 111 combination, a chain stitching mec anism for actuating the-usual curved hooked needle, operating so that the completion. of each stitch occurs at a time when the hooked needle is engaged in the leather preparatory to drawing a thread loop through the leather for the succeeding stitch, and a stopping mechanism operatlng to stop the machine and leave it at rest atv the point of completion of a stitch with the needle engaged in the leather, such stop motion being adapted to permit at will a sufficient reverse rotation of the machine to extract from the leather the needle in threadless condition, thus releasing the shoe and thread from the needle and the stitched shoe from the machine.

5. A power driven shoe sewing machine of the class known as welt-and-turn stitchfacilitating ready removal ofadapted for stitching the shoe ing machine,

its sole, and comprislng upper to the lip of in combination, a chain stitching mechanism,

the usual curved hooked neefor actuating that the completion of each dle, operating so stitch occurs at .a time when the hooked' -needle is engaged in the leather braking or stopping member acting to apply stopping force to the machine, the said member being capable of being rotated, after the machine has come to rest, in a re verse direction, along with the parts which have been stopped by it, sufiiciently to effect the extraction from the leather of the needle in threadless condition, thus releasing the shoe and thread from the needle and facilitating ready removal of the stitched shoe from the machine.

6. A power driven'shoe sewing machine of the class known as welt-and-turn stitching machine, adapted for stitching the shoe upper to the lip of its sole, and comprising in combination, a chain stitching mechanism for actuating the usual curved hooked nee-' dle, operating so that the completion of each stitch occurs at a 1 time when the hooked needle is engaged in the leather preparatory to drawing a thread'loop through the leather for'the succeeding stitch, and a stoppin mechanism operating to stop the machi e and leave it at rest at thepoint of completion of a stitch with the needle engaged in the leather, such stop motion being adapted to permit at will a reverse rotation of the machine, and a limiting means acting to pre vent reverse rotation-of the stopped parts beyond a predetermined extent sufficient to extract the needle from the leather.

(- 7. A power driven shoe sewing machine of the class known as welt-and-turn stitching machine,'adaptedfor stitching the shoe upper to the lip of its sole, and comprising in combination, a chain stitching mechanism for actuating the usual curved hooked needle, operating so that the completion'of each stitch occurs at a time when the hooked needle is enga ed in the leather preparatory to drawing a t read loop through the leather for the succeeding stitch, and a stopping mechanism operating to stop the machine and leave it at rest at the point of completion of a stitch with the needle engaged in the leather, such stop motion having,a frictional stopping member manually rotatable to a limited extent, after the machine has come to rest, and in a reverse direction, along with the parts stopped by it, sufliciently to extract v the needle from the leather.

In testimony whereof, I have .afiixed my signature hereto.

- AUGUST R. soHoENKY. f 

